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/*
* nandwrite.c - ported to busybox from mtd-utils
*
* Author: Baruch Siach <baruch@tkos.co.il>, Orex Computed Radiography
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*
* TODO: add support for large (>4GB) MTD devices
*/
//applet:IF_NANDWRITE(APPLET(nandwrite, _BB_DIR_USR_SBIN, _BB_SUID_DROP))
//kbuild:lib-$(CONFIG_NANDWRITE) += nandwrite.o
//config:config NANDWRITE
//config: bool "nandwrite"
//config: default n
//config: depends on PLATFORM_LINUX
//config: help
//config: Write to the specified MTD device, with bad blocks awareness
#include "libbb.h"
#include <mtd/mtd-user.h>
//usage:#define nandwrite_trivial_usage
//usage: "[-p] [-s ADDR] MTD_DEVICE [FILE]"
//usage:#define nandwrite_full_usage "\n\n"
//usage: "Write to the specified MTD device\n"
//usage: "\nOptions:"
//usage: "\n -p Pad to page size"
//usage: "\n -s ADDR Start address"
static unsigned next_good_eraseblock(int fd, struct mtd_info_user *meminfo,
unsigned block_offset)
{
while (1) {
loff_t offs;
if (block_offset >= meminfo->size)
bb_error_msg_and_die("not enough space in MTD device");
offs = block_offset;
if (xioctl(fd, MEMGETBADBLOCK, &offs) == 0)
return block_offset;
/* ioctl returned 1 => "bad block" */
printf("Skipping bad block at 0x%08x\n", block_offset);
block_offset += meminfo->erasesize;
}
}
int nandwrite_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int nandwrite_main(int argc UNUSED_PARAM, char **argv)
{
unsigned opts;
int fd;
ssize_t cnt;
unsigned mtdoffset, meminfo_writesize, blockstart;
struct mtd_info_user meminfo;
unsigned char *filebuf;
const char *opt_s = "0";
enum {
OPT_p = (1 << 0),
OPT_s = (1 << 1),
};
opt_complementary = "-1:?2";
opts = getopt32(argv, "ps:", &opt_s);
argv += optind;
if (argv[1])
xmove_fd(xopen_stdin(argv[1]), STDIN_FILENO);
fd = xopen(argv[0], O_RDWR);
xioctl(fd, MEMGETINFO, &meminfo);
mtdoffset = bb_strtou(opt_s, NULL, 0);
if (errno)
bb_error_msg_and_die("invalid number '%s'", opt_s);
/* Pull it into a CPU register (hopefully) - smaller code that way */
meminfo_writesize = meminfo.writesize;
if (mtdoffset & (meminfo_writesize - 1))
bb_error_msg_and_die("start address is not page aligned");
filebuf = xmalloc(meminfo_writesize);
blockstart = mtdoffset & ~(meminfo.erasesize - 1);
if (blockstart != mtdoffset) {
unsigned tmp;
/* mtdoffset is in the middle of an erase block, verify that
* this block is OK. Advance mtdoffset only if this block is
* bad.
*/
tmp = next_good_eraseblock(fd, &meminfo, blockstart);
if (tmp != blockstart) /* bad block(s), advance mtdoffset */
mtdoffset = tmp;
}
cnt = -1;
while (mtdoffset < meminfo.size) {
blockstart = mtdoffset & ~(meminfo.erasesize - 1);
if (blockstart == mtdoffset) {
/* starting a new eraseblock */
mtdoffset = next_good_eraseblock(fd, &meminfo, blockstart);
printf("Writing at 0x%08x\n", mtdoffset);
}
/* get some more data from input */
cnt = full_read(STDIN_FILENO, filebuf, meminfo_writesize);
if (cnt == 0) {
/* even with -p, we do not pad past the end of input
* (-p only zero-pads last incomplete page)
*/
break;
}
if (cnt < meminfo_writesize) {
if (!(opts & OPT_p))
bb_error_msg_and_die("input size is not rounded up to page size, "
"use -p to zero pad");
/* zero pad to end of write block */
memset(filebuf + cnt, 0, meminfo_writesize - cnt);
}
xlseek(fd, mtdoffset, SEEK_SET);
xwrite(fd, filebuf, meminfo_writesize);
mtdoffset += meminfo_writesize;
if (cnt < meminfo_writesize)
break;
}
if (cnt != 0) {
/* We filled entire MTD, but did we reach EOF on input? */
if (full_read(STDIN_FILENO, filebuf, meminfo_writesize) != 0) {
/* no */
bb_error_msg_and_die("not enough space in MTD device");
}
}
if (ENABLE_FEATURE_CLEAN_UP) {
free(filebuf);
close(fd);
}
return EXIT_SUCCESS;
}
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